[8208] in linux-scsi channel archive
Re: semaphores and queueing commands
daemon@ATHENA.MIT.EDU (Alan Cox)
Thu Feb 24 06:59:02 2000
To: mdharm-scsi@one-eyed-alien.net (Matthew Dharm)
Date: Thu, 24 Feb 2000 11:51:48 +0000 (GMT)
Cc: linux-scsi@vger.rutgers.edu (The Linux SCSI list)
In-Reply-To: <Pine.LNX.4.10.10002232135460.29543-100000@ziggy.one-eyed-alien.net> from "Matthew Dharm" at Feb 23, 2000 10:02:25 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
> do lots more stuff
> call the scsi_done() function
Do you call scsi_done holding the io_request lock ?
> And, while I'm writting this, is there some generic kernel queuing code
> that I can use somewhere? i.e. something that allows me to declare a
The sk_buff code has some examples of generic irq safe queueing code. It
basically does
add_
spin_lock_irqsave(&queue_lock, flags);
item->next=NULL;
queue->tail=item;
spin_unlock_irqrestore(queue_lock, flags)
etc. and spinlocks very short pieces of code.
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